They drift along in the worlds' oceans at a depth of 2,000 metres -- more than a mile deep -- constantly monitoring the temperature, salinity, pressure and velocity of the upper oceans.
Then, about once every 10 days, a bladder on the outside of these buoys inflates and raises them slowly to the surface gathering data about each strata of seawater they pass through. After an upward journey of nearly six hours, the Argo monitors bob on the waves while an onboard transmitter sends their information to a satellite that in turn retransmits it to several land-based research computers where it may be accessed by anyone who wishes to see it.
These 3,000 yellow sentinels --about the size and shape of a large fence post -- free-float the world's oceans, season in and season out, surfacing between 30 and 40 times a year, disgorging their findings, then submerging again for another fact-finding voyage.
It's fascinating to watch their progress online. (The URLs are too complex to reproduce here, but Google "Argo Buoy Movement" or "Argo Float Animation," and you will be directed to the links.)
When they were first deployed in 2003, the Argos were hailed for their ability to collect information on ocean conditions more precisely, at more places and greater depths and in more conditions than ever before. No longer would scientists have to rely on measurements mostly at the surface from older scientific buoys or inconsistent shipboard monitors.
So why are some scientists now beginning to question the buoys' findings? Because in five years, the little blighters have failed to detect any global warming. They are not reinforcing the scientific orthodoxy of the day, namely that man is causing the planet to warm dangerously. They are not proving the predetermined conclusions of their human masters. Therefore they,and not their masters' hypotheses, must be wrong.
